CVE-2018-1158: MikroTik RouterOS

Medium severity, CVSS 6.5. EPSS: 2.5% chance of exploitation in the next 30 days.

Mikrotik RouterOS before 6.42.7 and 6.40.9 is vulnerable to a stack exhaustion vulnerability. An authenticated remote attacker can crash the HTTP server via recursive parsing of JSON.

Affected products

• MikroTik RouterOS: before 6.40.9 (fixed in 6.40.9); before 6.42.7 (fixed in 6.42.7)

Published 2018-08-23. Last modified 2026-06-17.